Sponge



FIG. 1 is a perspective view of a sponge of the invention;

FIG. 2 is a top plan view thereof, the bottom plan view being essentially identical;

FIG. 3 is an end elevational view thereof;

FIG. 4 is an end elevational view thereof; and,

FIG. 5 is a side elevational view thereof, the other end being essentially a mirror image.

The surface shading illustrated in the drawings is provided merely to highlight the contour of design; it is not intended to be illustrative of texture or gloss and forms no part of the claimed design. 

The ornamental design for a sponge, as shown and described. 